Book Block: Endpapers, text block and all other materials before hard or soft binding.

Bonded Leather: A hard binding material that is made by mixing genuine leather fibers with an adhesive – bonding them into a viable cover material that is then embossed to reproduce the original texture. Less durable than genuine leather, it does retain it’s distinct smell.

Text Block: The pages/leaves of a book after they have been bound together. A group of printed or written pages that may be or have been bound, excluding all paper to be added by the bookbinder such as the endpapers, etc.

Book Block: Endpapers, text block and all other materials before hard or soft binding.